Cubic Feet to Cubic Yards Converter
Convert cubic feet to cubic yards, cubic yards to cubic feet, calculate volume from length, width and height, and estimate material orders for concrete, gravel, mulch, sand and topsoil — all in one calculator, with live results and step-by-step formulas.
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Volume & Material Converter
Understanding Cubic Feet and Cubic Yards
Volume is one of the most common measurements in construction, landscaping and engineering, and few conversions come up more often than turning cubic feet into cubic yards. A cubic foot (ft³) is the amount of space inside a cube that measures one foot on every edge — one foot long, one foot wide and one foot tall. It is a small, practical unit, useful for describing the volume of a single paver, a small planter, or a section of a room. A cubic yard (yd³), by contrast, is the volume of a cube measuring three feet, or one yard, on every edge. Because a yard is three times longer than a foot in each of the three dimensions, a cubic yard contains 3 × 3 × 3, or exactly 27 cubic feet. That single relationship, 27 cubic feet equals 1 cubic yard, is the backbone of almost every material calculation in residential and commercial construction.
Converting between cubic feet and cubic yards matters because the two units serve different purposes. Cubic feet are ideal for describing small, precise volumes — the capacity of a cooler, the size of a garden bed, or the output of a small mixer. Cubic yards, meanwhile, are the unit that concrete plants, gravel yards, mulch suppliers and topsoil distributors actually sell in. When a supplier quotes a price "per cubic yard," a homeowner or contractor working in feet and inches needs a fast, accurate way to translate their measurements into that unit before placing an order. Get the conversion wrong, and you either run short mid-pour or pay for material you never use.
This calculator was built to remove that friction entirely. It performs four related jobs, each addressing a different stage of a real construction or landscaping project. The first mode, Cubic Feet to Cubic Yards, takes a volume you already know in cubic feet and instantly divides it by 27 to hand back the equivalent in cubic yards, along with cubic meters, cubic inches, cubic centimeters, liters and US gallons for anyone working across unit systems. The second mode, Cubic Yards to Cubic Feet, runs the same relationship in reverse, multiplying by 27, which is exactly what you need when a supplier's cubic-yard quote has to be checked against a cubic-foot measurement taken on site.
The third mode, Volume from Dimensions, solves the more common real-world problem: you rarely start with a volume already known in cubic feet — you start with a tape measure. Enter the length, width and height (or depth) of a space in feet, inches, yards, meters or centimeters, and the calculator multiplies the three dimensions together and converts the result into cubic feet, cubic yards, cubic meters, liters and gallons automatically, with no manual unit juggling required. The fourth mode, the Material Estimator, builds on that same dimensional calculation but adds the practical layer that contractors actually need before they call a supplier: a recommended order quantity that accounts for standard waste, compaction and settling allowances, rounded to a sensible ordering increment, alongside the material type you selected — concrete, gravel, sand, mulch, topsoil, stone, compost or a custom material.
Every calculation updates live, without a page refresh, and every result is broken down step by step so you can see exactly how the formula was applied — not just the final number. That transparency matters. Contractors, landscapers, engineers, architects, concrete suppliers, construction companies and DIY homeowners all use this tool for slightly different reasons, but they share the same need: a fast, trustworthy way to move between cubic feet and cubic yards, verify a quantity before ordering, and avoid the two most expensive mistakes in material planning — ordering too little and running out mid-project, or ordering too much and paying for waste. Whether you're pouring a concrete slab, spreading gravel on a driveway, calculating mulch for a flower bed, estimating topsoil for a raised garden, planning an excavation, or sizing a foundation footing, this converter handles the arithmetic so you can focus on the project itself.
Complete Guide to Cubic Feet and Cubic Yards
Everything you need to know about volume, conversions and material estimating.
What cubic feet measure
A cubic foot describes three-dimensional space, not a length or an area. Where a linear foot measures distance and a square foot measures a flat surface, a cubic foot measures how much a container, hole, or solid object can hold or occupy. It is calculated by multiplying length × width × height, all expressed in feet. A box that is 2 feet long, 2 feet wide and 2 feet tall holds 8 cubic feet — not 6, and not 4, because volume multiplies rather than adds each dimension. Builders use cubic feet for small-batch material calculations, HVAC airflow, storage capacity, and any measurement where working in whole cubic yards would be impractically coarse.
What cubic yards measure
A cubic yard scales the same idea up to a size that matches how bulk materials are transported and sold. A standard dump truck, concrete mixer truck, or bulk delivery is quoted in cubic yards because the unit conveniently matches typical truck capacities — a small dump trailer might hold 1 to 3 cubic yards, while a full-size dump truck can carry 10 to 16 cubic yards. Suppliers of concrete, gravel, sand, mulch, topsoil, and stone price their products per cubic yard for this reason, which is exactly why converting a project's cubic-foot measurements into cubic yards is the final, essential step before placing an order.
The relationship between cubic feet and cubic yards
Because one yard equals three feet, a cube measuring one yard on each side measures three feet on each side. Multiplying the three dimensions together — 3 ft × 3 ft × 3 ft — gives 27 cubic feet. This is why 27 cubic feet always equals exactly 1 cubic yard, regardless of the shape of the volume you're measuring. It does not matter whether your 27 cubic feet come from a tall, narrow shape or a wide, shallow one — the conversion factor of 27 applies universally, because it is derived purely from the linear relationship between feet and yards, not from any particular shape.
Volume calculations from real measurements
Most real projects don't start with a known cubic-foot total — they start with a tape measure and three numbers: length, width, and height or depth. The general volume formula for a rectangular space (a slab, a trench, a raised bed, a room) is simply Volume = Length × Width × Height, provided all three measurements share the same unit. Mixing units — say, feet for length and inches for depth — is the single most common source of volume-calculation errors, which is why this calculator converts every dimension to a common unit internally before multiplying.
Unit conversions beyond feet and yards
Once a volume is known in cubic feet, converting to other units follows fixed, exact multipliers: multiply cubic feet by 0.0283168466 for cubic meters, by 28.3168466 for liters, by 7.48052 for US gallons, and by 1,728 for cubic inches. These constants come from the exact relationship between the foot and the meter (1 foot = 0.3048 meters exactly), so they never change and never need rounding beyond the precision you choose to display.
Estimating materials: concrete, gravel, sand, mulch and topsoil
Material estimating always follows the same three-step pattern regardless of material: calculate the volume of the area to be filled in cubic feet, divide by 27 to get cubic yards, then add a waste allowance before rounding to an order quantity. For concrete slabs and footings, multiply the slab's length by width by thickness (commonly 4 to 6 inches, converted to feet) to get cubic feet, then divide by 27. For gravel driveways and paths, use the same formula with the intended gravel depth, typically 2 to 4 inches for a topping layer or up to 6 inches for a full base course. Sand for bedding under pavers or pipe follows an identical calculation, usually with a shallow 1 to 2 inch depth. Mulch beds are calculated the same way, with a typical depth of 2 to 3 inches for a refresh or 3 to 4 inches for new beds. Topsoil for raised beds or lawn leveling uses whatever depth the planting or grading plan calls for, often 4 to 8 inches for vegetable beds.
Why waste allowance matters in material orders
No real job site is a perfectly flat, perfectly measured rectangle. Subgrade dips and rises, forms shift slightly, materials compact after delivery, and spillage happens during spreading. Industry practice is to add roughly 5 to 10 percent to a calculated material volume before ordering, then round up to a supplier's typical increment — often a quarter or half cubic yard. This calculator's Material Estimator mode builds a 10 percent allowance into its recommended order automatically, alongside the raw, unrounded volume, so you can see both numbers and decide what fits your project's risk tolerance.
Landscaping, excavation and foundation applications
Landscapers use cubic yard calculations daily — for garden bed topsoil, retaining wall backfill, drainage stone, and mulch coverage across irregular beds (which are usually broken into simpler rectangular sections and summed). Excavation contractors calculate the cubic yardage of soil to be removed from a foundation trench or basement dig to quote hauling costs, since haulers price per cubic yard of spoil. Foundation and footing volumes follow the same length × width × depth formula, just at a smaller, more precise scale, often worked in cubic feet before a final conversion to cubic yards for the concrete order.
Driveways, retaining walls and drainage systems
Driveway base and surface layers are calculated by breaking the driveway into its length and average width, multiplying by the depth of each material layer (compacted base gravel, then a finish layer), and converting each layer's volume separately since materials and depths usually differ. Retaining wall projects need backfill volume behind the wall, calculated the same way, while drainage systems (French drains, dry wells) need trench volume for the gravel and drainage stone that fills them.
Engineering, architecture and manufacturing uses
Beyond residential construction, engineers use cubic yard and cubic foot calculations for earthwork cut-and-fill estimates on larger civil projects, architects use them for space planning and structural volume takeoffs, and manufacturers use cubic feet routinely for packaging, shipping container capacity, and storage tank sizing, converting to cubic yards only when bulk material handling is involved.
Common conversion mistakes to avoid
The most frequent error is forgetting to divide by 27 at all and ordering material by the cubic-foot number instead — a mistake that can lead to ordering 27 times too much or too little. The second most common mistake is mixing linear and cubic units, such as multiplying square footage (an area) by a depth without confirming both are already in consistent linear units. A close third is using an inconsistent unit for one dimension, like measuring depth in inches while length and width are in feet, without converting first. This calculator's Volume from Dimensions and Material Estimator modes solve all three problems automatically by handling unit conversion internally before any multiplication happens.
How the Calculator Works
Four steps take you from raw measurements to an order-ready material quantity.
Choose a Mode
Pick Cubic Feet → Cubic Yards, Cubic Yards → Cubic Feet, Volume from Dimensions, or Material Estimator depending on what you already know and what you need to find.
Enter Measurements
Type in a known volume, or the length, width and height/depth of your space. Feet, inches, yards, meters and centimeters are all accepted as input units.
Automatic Conversion
The calculator normalizes every dimension to feet, multiplies to find cubic feet, then instantly derives cubic yards, cubic meters, liters, gallons and more.
Review the Results
Read the primary result, check every alternate unit in the secondary cards, and — in Material Estimator mode — see a rounded, waste-adjusted order quantity.
Cubic Feet and Cubic Yards Formulas
The exact equations behind every result this calculator produces.
Divide any cubic-foot volume by 27 to find the equivalent in cubic yards. Example: 135 ft³ ÷ 27 = 5 yd³.
Multiply any cubic-yard volume by 27 to find the equivalent in cubic feet. Example: 3 yd³ × 27 = 81 ft³.
Multiply three matching-unit dimensions together to find total volume before converting to your target unit.
The exact metric conversion factor, derived from 1 foot equalling 0.3048 meters.
Useful for comparing volumes against liquid-measured specifications or metric material data sheets.
A standard 10% waste allowance, rounded up to the nearest quarter cubic yard for easy ordering.
Why 27 Cubic Feet Equals 1 Cubic Yard
A cubic yard is a cube 3 feet on every side. Splitting it into 1-foot cubes along each edge gives 3 × 3 × 3 = 27 individual cubic feet.
Step-by-Step Examples
Six worked calculations covering every mode of the converter.
Example 1 — Cubic Feet to Cubic Yards
A volume of 54 cubic feet converts to exactly 2 cubic yards.
Example 2 — Cubic Feet to Cubic Yards
A volume of 81 cubic feet converts to exactly 3 cubic yards.
Example 3 — Cubic Yards to Cubic Feet
4 cubic yards of material is equivalent to 108 cubic feet.
Example 4 — Volume from Dimensions (Concrete Slab)
A 12 × 10 foot slab poured 6 inches (0.5 ft) thick needs about 2.22 cubic yards of concrete.
Example 5 — Volume from Dimensions (Mulch Bed, Mixed Units)
An 8 × 6 foot bed covered 4 inches deep in mulch needs roughly 0.59 cubic yards.
Example 6 — Material Estimator (Gravel Driveway with Waste Allowance)
A 20 × 15 foot driveway base at 6 inches deep needs 5.56 cubic yards of gravel; ordering 5.75 cubic yards builds in a standard waste allowance.
Quick Reference Tables
Common cubic feet, cubic yard and material conversions at a glance.
| Cubic Feet | Cubic Yards |
|---|---|
| 27 | 1 |
| 54 | 2 |
| 81 | 3 |
| 108 | 4 |
| 135 | 5 |
| Cubic Yards | Cubic Feet |
|---|---|
| 1 | 27 |
| 2 | 54 |
| 5 | 135 |
| 10 | 270 |
| 20 | 540 |
| Material | Typical Use |
|---|---|
| Concrete | Slabs & Foundations |
| Gravel | Driveways |
| Sand | Bedding |
| Mulch | Landscaping |
| Topsoil | Gardens |
| Stone | Drainage |
Benefits of This Converter
Why contractors, landscapers and homeowners reach for this tool before every order.
Instant Conversions
Cubic feet, cubic yards, cubic meters, liters and gallons calculate live as you type — no submit-and-wait.
Built-In Material Estimator
Go straight from dimensions to a rounded, waste-adjusted order quantity for concrete, gravel, mulch or topsoil.
Live Calculations
Every mode recalculates instantly on submit, with a scrollable results panel and a live volume preview graphic.
Multiple Unit Support
Enter dimensions in feet, inches, yards, meters or centimeters — the calculator converts everything internally.
Interactive Volume Diagram
A live fill-level graphic gives an intuitive sense of scale as you adjust your inputs.
Mobile-Friendly
The full calculator, results and diagrams work smoothly on phones and tablets, not just desktop browsers.
Practical Applications
Where cubic feet to cubic yards conversions get used on real job sites.
Concrete Ordering
Convert slab, footing and foundation dimensions into cubic yards before calling a ready-mix supplier, and add a waste allowance for spillage and uneven subgrade.
Gravel Estimation
Calculate driveway, path and base-course gravel volume, then round up to account for compaction after the material settles.
Mulch Calculations
Estimate mulch needed for flower beds and landscaped borders by entering bed dimensions and a target depth in inches.
Landscaping Projects
Plan topsoil, compost and stone quantities for raised beds, lawn leveling and garden renovations across multiple bed sections.
Excavation Planning
Determine cubic yardage of soil to be removed from a trench or basement dig to budget hauling costs accurately.
Foundation Work
Calculate footing and foundation wall concrete volumes precisely, working in cubic feet before converting to a yardage order.
Driveway Construction
Layer base gravel and finish material calculations separately, since each layer typically uses a different material and depth.
Retaining Walls
Estimate backfill volume behind a retaining wall using the same length × width × depth approach as any rectangular excavation.
Drainage Systems
Size French drain and dry well trenches, then calculate the gravel or drainage stone volume needed to fill them.
Engineering & Architecture
Support cut-and-fill earthwork estimates and structural volume takeoffs where cubic yard totals inform cost and logistics.
Common Cubic Feet to Cubic Yards Mistakes
Avoid these errors and your material orders will be right the first time.
Forgetting to divide by 27
Ordering material using the raw cubic-foot number instead of converting to cubic yards can lead to a wildly incorrect order.
Mixing linear and cubic units
Multiplying a square-footage area by a depth without confirming both are in the same linear unit produces an incorrect volume.
Incorrect depth measurements
Depth is the dimension most often measured casually; a small error here scales directly into the final volume.
Using inconsistent units
Measuring length and width in feet but depth in inches without converting first throws off every downstream calculation.
Not rounding material orders
Ordering the exact calculated volume with no buffer often leads to a shortfall once compaction and spillage are accounted for.
Ignoring waste allowance
Skipping the standard 5–10% waste buffer is the most common reason contractors need a costly second delivery.
Manual calculation errors
Long division by 27 by hand introduces rounding mistakes that a calculator avoids entirely.
Incorrect volume estimates for irregular areas
Complex shapes should be broken into simple rectangular sections and summed rather than estimated as one average shape.
Frequently Asked Questions
Everything you need to know about converting cubic feet to cubic yards.
What is a cubic foot?
A cubic foot (ft³) is the volume of a cube measuring one foot on every side. It is a standard imperial unit used to measure volume, material quantity, and shipping or storage space.
What is a cubic yard?
A cubic yard (yd³) is the volume of a cube measuring three feet, or one yard, on every side. It equals 27 cubic feet and is the standard unit for ordering bulk materials such as concrete, gravel, mulch and topsoil.
Why is 1 cubic yard equal to 27 cubic feet?
A cubic yard is a cube 3 feet long, 3 feet wide and 3 feet tall. Multiplying 3 × 3 × 3 gives 27, so one cubic yard always equals exactly 27 cubic feet, regardless of the shape of the volume being measured.
How do I convert cubic feet to cubic yards?
Divide the number of cubic feet by 27. For example, 108 cubic feet ÷ 27 equals 4 cubic yards. This calculator performs that division instantly and also shows the equivalent in cubic meters, liters and gallons.
How do I calculate volume?
Multiply length × width × height, making sure all three measurements use the same unit before multiplying. Use the Volume from Dimensions mode to enter mixed units and let the calculator convert automatically.
How do I estimate concrete for a slab or footing?
Multiply the slab's length by width by thickness in feet to get cubic feet, divide by 27 for cubic yards, then add roughly 5 to 10 percent for spillage and uneven subgrade before ordering.
How much gravel do I need for a driveway?
Calculate the driveway's volume using length × width × depth, convert to cubic yards by dividing by 27, then round up to account for compaction and settling after delivery.
Can I calculate mulch volume with this tool?
Yes. Select the Material Estimator mode, choose Mulch as the material, and enter the bed's length, width and desired mulch depth to get a cubic yard estimate with a recommended order quantity.
Why should I round up material orders?
Ground is rarely perfectly level, materials settle and compact after delivery, and small measurement errors add up. Rounding up, typically by 5 to 10 percent, prevents a costly second delivery.
Can I use metric units in this converter?
Yes. The Volume from Dimensions and Material Estimator modes accept meters and centimeters in addition to feet, inches and yards, and every result is also shown in cubic meters and liters.
Is this cubic feet to cubic yards calculator accurate?
Yes. It uses the exact conversion factor of 27 cubic feet per cubic yard along with standard international conversion constants for meters, liters and gallons, and lets you choose up to six decimal places of precision.
Is this calculator free to use?
Yes, the calculator is completely free, requires no signup, and runs directly in your browser with no page reloads.
Does this calculator work on mobile devices?
Yes, the layout, calculator card and diagrams are fully responsive and work smoothly on phones, tablets and desktop browsers.
Who should use a cubic feet to cubic yards converter?
Contractors, landscapers, engineers, architects, concrete suppliers, construction companies and homeowners planning a DIY project all rely on quick, accurate volume conversions when ordering materials or estimating excavation.
Why use a cubic feet to cubic yards converter instead of calculating by hand?
Manual division by 27 and manual unit conversion between feet, inches, yards, meters and centimeters both introduce rounding errors. A calculator removes that risk and shows every intermediate step for verification.
Convert Cubic Feet to Cubic Yards Instantly
Quickly convert cubic feet and cubic yards, estimate construction materials, calculate project volumes, and simplify planning with this free calculator.